Full color Micro-LED displays with cadmium-free quantum dots patterned by photolithography technology
2020
A full-color display consisting of red and green
photoluminescence cadmium-free quantum dots (QDs) as the color conversion
material and excited by a 68×68 blue
micro-LED flip chip array mounted on an active-matrix driving board was completed in this study. The
QD photoresist (QDPR) lithography technology was reported in detail, and
it has been proven to be a stable process route. The suitable thickness of
12±1µm of the QDPR and black matrix was proposed to reduce the
light cross talk between different sub-pixels. The thickness of the common
color filter of 1–2 µm was made successfully between the quantum dot film
and the cover glass, which can greatly reduce the leakage of blue
backlight and decrease the quantum dots excitation by the ambient light,
as well as improve the color gamut and color purity of the display panel.
In addition, the high red and green light conversion efficiency reaches up
to 78.1% and 296.5%, respectively, and the screen display can reach 98.8%
NTSC on the CIE 1931 chromaticity. Representative RGB monochromatic
pictures were displayed successfully and ≤0.04 viewing angle deviation of
the display was measured precisely.
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